The fraction of identical genotypes was computed for all two-way combinations of 109
RI strains. Those pairs of strains for which the percentage of shared genotypes was
greater than 75% were flagged and one member of the pair was eliminated from the BXN
set. Corresponding matrices for AXB- BXA, BXD, BXH and the complete BXN matrix are
available online at [30] in text format.